i would like to use get_posts function with meta_key / meta_value / meta_compare function, the problem is, that I need to return posts, where some specific meta_key is not set (not even NULL, 0 ...)
no settings works, as it is used in SQL query, so 'something'='' is then looking for rows with something set (to nothing)
get_posts to show post where meta_key is not set (1 post)
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